Sarnia Threshold Days by Year

13 fixed thresholds counted per year at Sarnia (CA006127513): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sarnia Thresholds

Sarnia: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1892 with 34.
Sarnia: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1956 with 9.
Sarnia: days with 10 cm (3.9 in) or more of snowfall in 35 years, most in 1951 with 8.
Sarnia: days with 50 mm (1.97 in) or more of precipitation in 14 years, most in 1894 with 2.
13 fixed thresholds have at least one qualifying day at Sarnia.

Days at or above 30 C (86 F)

12 years with a qualifying day

Days per year at Sarnia with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 1955.

For each year, a bar from the first to the last day at Sarnia meeting 30 C (86 F).

First to last qualifying date each year at Sarnia
Year	First date	Last date
1949	1949-05-04	1949-08-27
1950	1950-06-08	1950-08-27
1951	1951-07-15	1951-10-05
1952	1952-06-06	1952-09-14
1953	1953-06-05	1953-09-04
1954	1954-06-10	1954-09-07
1955	1955-06-05	1955-09-19
1956	1956-05-30	1956-08-31
1957	1957-06-16	1957-09-02
1958	1958-06-30	1958-08-29
1959	1959-05-06	1959-09-09
1960	1960-04-23	1960-09-08

Every Fixed Threshold

Fixed thresholds at Sarnia
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	12	34	1955	11
35 C (95 F): Days	4	6	1955	6
90 F (32.2 C): Days	11	22	1955	2
0 C (32 F): Ice days (max	12	81	1960	81
0 C (32 F): Frost days (min	12	143	1958	139
-10 C (14 F): Days with min	12	44	1958	42
-20 C (-4 F): Days with min	7	4	1951	3
20 C (68 F): Tropical nights (min	12	27	1959	2
10 mm (0.39 in): Days with 10 mm or more rain	37	34	1892	19
25 mm (0.98 in): Days with 25 mm or more rain	37	9	1956	6
50 mm (1.97 in): Days with 50 mm or more rain	14	2	1894	1
10 cm (3.9 in): Days with 10 cm or more snowfall	35	8	1951	6
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	1960	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

Data for Sarnia threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Year	Days	Decade average
1949	31	31
1950	7	18.2
1951	10	18.2
1952	31	18.2
1953	18	18.2
1954	19	18.2
1955	34	18.2
1956	11	18.2
1957	13	18.2
1958	12	18.2
1959	27	18.2
1960	11	11

Sarnia Threshold Days by Year

Key Facts for Sarnia Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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